US4085390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Symmetrical stripline package
Assignee: International Telecommunications Satellite Organization
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Filing: 1977-09-09
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Granted: 1978-04-18
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Expires: 1997-09-09
Abstract
Abstract A microwave stripline package provides symmetrical ground currents while permitting discrete components such as diodes, terminations, capacitors, etc.to be used. The package comprises a pair of face-to-face printed circuit boards, each of which is formed of a dielectric having a ground plane on one surface. The discrete components together with a printed circuit are assembled on one of the boards while a portion of the dielectric of the other board is cut away to provide mechanical clearance for the circuit components. Matching portions of the dielectrics on either side of the printed circuit are cut away to receive a pair of metal blocks which contact both the upper and lower ground planes in order to form a screened enclosure. The dimensions of the printed circuit within the screened enclosure are selected to provide impedance matching with the stripline outside the enclosure.
Inventors
- 👤 Arthur Frederick Standing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:15
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/02; H01P3/08; H01P3/085; H01P1/00; H01P1/005; H01P3/081
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
224 words
A microwave package which provides symmetrical ground currents when discrete components are used in a stripline circuit, comprising: a first printed circuit board formed of a first dielectric material and having a continuous first ground plane on one surface and a printed circuit on the opposite surface; at least one discrete component electrically coupled to said printed circuit; a second printed circuit board formed of a second dielectric material and having a continuous second ground plane on one surface a portion of said second dielectric material being cut away to expose said second ground plane; and first and second metal blocks each having one cross-sectional dimension equal to the combined thicknesses of said first and second dielectric materials, said first and second dielectric materials having apertures wherein which expose said first and second ground planes, respectively, on either side of and adjacent the printed circuit where said discrete component is connected, said metal blocks being located within said apertures and contacting said ground planes with the exposed surfaces of said first and second dielectric materials in facing relation to one another, said cut away portion of said second dielectric being entirely disposed between said metal bars to form, in conjunction with said first printed circuit conductor, said first dielectric, said metal bars and said ground planes, a microstrip circuit housed within a screened enclosure.
Claim 2
Dependent Claim
224 words
A microwave package which provides symmetrical ground currents when discrete components are used in a stripline circuit, comprising: a first printed circuit board formed of a first dielectric material and having a continuous first ground plane on one surface and a printed circuit on the opposite surface; at least one discrete component electrically coupled to said printed circuit; a second printed circuit board formed of a second dielectric material and having a continuous second ground plane on one surface a portion of said second dielectric material being cut away to expose said second ground plane; and first and second metal blocks each having one cross-sectional dimension equal to the combined thicknesses of said first and second dielectric materials, said first and second dielectric materials having apertures wherein which expose said first and second ground planes, respectively, on either side of and adjacent the printed circuit where said discrete component is connected, said metal blocks being located within said apertures and contacting said ground planes with the exposed surfaces of said first and second dielectric materials in facing relation to one another, said cut away portion of said second dielectric being entirely disposed between said metal bars to form, in conjunction with said first printed circuit conductor, said first dielectric, said metal bars and said ground planes, a microstrip circuit housed within a screened enclosure.
Claim 3
Dependent Claim
41 words
A microwave package as recited in claim 1, wherein said discrete component is mounted on said opposite surface of said first printed circuit board and the cut away portion of the second dielectric material provides mechanical clearance for said discrete component.
Claim 4
Dependent Claim
77 words
A microwave package according to claim 1, wherein only a portion of said second dielectric material between said metal bars is cut away, the portion of said printed circuit between said metal bars but not underlying said cut away portion of said second dielectric forming the center conductor of a rectangular coax, the outer conductor of which is formed by said metal bars and said ground planes, said rectangular coax and said microstrip circuit having matching impedances.
Claim 5
Dependent Claim
113 words
A microwave package according to claim 3, wherein at least a first conductor of said printed circuit underlying said cut away portion of said second dielectric material extends beyond said metal bars, thereby forming, in the order mentioned, a microstrip conductor in the area underlying said cut away portion of said second dielectric material, a rectangular coax center conductor in the area between said metal bars but not underlying said cut away portion, and a stripline center conductor beyond said metal bars, the spacing between said first conductor and said metal bars being controlled to provide impedance matching between said stripline and said rectanglar coax and between said rectangular coax and said microstrip.
Claim 6
Dependent Claim
15 words
A microwave package as recited in claim 4, wherein said discrete component is a diode.
Claim 7
Dependent Claim
15 words
A microwave package as recited in claim 4, wherein said discrete component is a capacitor.
Claim 8
Dependent Claim
15 words
A microwave package as recited in claim 4, wherein said discrete component is a termination.
Claim 9
Dependent Claim
54 words
A microwave package according to claim 4, wherein said printed circuit further includes: a second conductor underlying said cut away portion of said second dielectric material and spaced from said first conductor; and a ground pad spaced from said second conductor and connected to said first continuous ground plane by a plated through hole.
Claim 10
Dependent Claim
38 words
A microwave package according to claim 8, wherein said at least one discrete component includes: means for capacitively coupling said first conductor to said second conductor, and; a diode connected between said second conductor and said ground pad.
Claim 11
Dependent Claim
119 words
A microwave package according to claim 9, wherein said at least first conductor comprises an RF input stripline, said printed circuit further comprising a fourth conductor underlying said cut away portion of said second dielectric material and extending beyond said metal bars to form, in the order mentioned, a microstrip in the area underlying said cut away portion of said second dielectric material, a rectangular coax in the area between said metal bars but not underlying said cut away portion, and a bias input stripline beyond said metal bars, said at least one discrete component further comprising bias decoupling means connected between said fourth conductor and said second conductor and connected between said fourth conductor and said ground pad.
Claim 12
Independent Claim
267 words
A method of fabricating a microwave package which provides symmetrical ground currents when discrete components are used in microwave stripline circuits, comprising: forming a first printed circuit board of a dielectric material with a ground plane on one surface and a printed circuit on the opposite surface; forming a second printed circuit board of a dielectric material with a ground plane on one surface only; cutting slots in the dielectric material of the first printed circuit board to expose the ground plane on either side of and adjacent to the printed circuit; cutting matching slots in the dielectric material of the second printed circuit board to expose the ground plane and mechanical registry with the slots cut in the dielectric material of the first printed circuit board; cutting away a portion of the second dielectric material between said matching slots to expose the ground plane of said second printed circuit board; mounting at lease one discrete component on the printed circuit between said slots; inserting metal blocks in the slots cut on either side of the printed circuit to contact the ground plane of the first printed circuit board, said metal blocks having one cross-sectional dimension equal to the combined thicknesses of the dielectric materials of said first and second printed circuit boards; and placing said second printed circuit board over said first printed circuit board so that said metal blocks extend through said matching slots and contact the exposed ground plane of said second printed circuit board with the exposed dielectric surfaces of said first and second printed circuit boards in facing relation to one another.
Claim 13
Independent Claim
267 words
A method of fabricating a microwave package which provides symmetrical ground currents when discrete components are used in microwave stripline circuits, comprising: forming a first printed circuit board of a dielectric material with a ground plane on one surface and a printed circuit on the opposite surface; forming a second printed circuit board of a dielectric material with a ground plane on one surface only; cutting slots in the dielectric material of the first printed circuit board to expose the ground plane on either side of and adjacent to the printed circuit; cutting matching slots in the dielectric material of the second printed circuit board to expose the ground plane and mechanical registry with the slots cut in the dielectric material of the first printed circuit board; cutting away a portion of the second dielectric material between said matching slots to expose the ground plane of said second printed circuit board; mounting at lease one discrete component on the printed circuit between said slots; inserting metal blocks in the slots cut on either side of the printed circuit to contact the ground plane of the first printed circuit board, said metal blocks having one cross-sectional dimension equal to the combined thicknesses of the dielectric materials of said first and second printed circuit boards; and placing said second printed circuit board over said first printed circuit board so that said metal blocks extend through said matching slots and contact the exposed ground plane of said second printed circuit board with the exposed dielectric surfaces of said first and second printed circuit boards in facing relation to one another.
Claim 14
Dependent Claim
32 words
The method according to claim 11 further comprising: affixing metal plates to the ground planes of said first and second printed circuit boards in order to assure continuity of said ground planes.
References Cited (Backward Citations)
US3135935A
Cited
US3868594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |